log4j将stdout重定向到DailyRollingFileAppender | dout重定向到DailyRollingFileAppender

本文介绍了log4j将stdout重定向到DailyRollingFileAppender的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有一个使用log4j的java应用程序。

配置：

  log4j.rootLogger =信息，文件
 
 log4j.appender.file = org.apache.log4j.DailyRollingFileAppender 
 log4j.appender.file.File = $ {user.home} /logs/app.log 
 log4j.appender .file.layout = org.apache.log4j.PatternLayout 
 log4j.appender.file.layout.ConversionPattern =％d [％t]％c％p％m％n

所以所有的日志语句都被正确附加到文件中，但是我正在丢失stdout和stderr。如何将异常堆栈跟踪和sysouts重定向到日常滚动文件？

解决方案

  //我在Log4J中设置了一个ConsoleAppender格式化Stdout / Stderr 
 log4j.rootLogger = DEBUG，CONSOLE 
 log4j.appender.CONSOLE = org.apache.log4j.ConsoleAppender 
 log4j.appender.CONSOLE.layout = org.apache.log4j.PatternLayout 
 log4j .appender.CONSOLE.layout.ConversionPattern = [％t]％-5p％c  - ％m％n 
 
 
 //我在启动时调用此StdOutErrLog.tieSystemOutAndErrToLog（）
 
 public class StdOutErrLog {
 
 private static final Logger logger = Logger.getLogger（StdOutErrLog.class）; 
 
 public static void tieSystemOutAndErrToLog（）{
 System.setOut（createLoggingProxy（System.out））; 
 System.setErr（createLoggingProxy（System.err））; 
} 
 
 public static PrintStream createLoggingProxy（final PrintStream realPrintStream）{
返回新的PrintStream（realPrintStream）{
 public void print（final String string）{
 realPrintStream.print（string）; 
 logger.info（string）; 
} 
}; 
} 
}

I have a java app that uses log4j.

Config:

log4j.rootLogger=info, file

log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.File=${user.home}/logs/app.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d [%t] %c %p %m%n

So all the log statements are correctly appended to the file, but i am losing stdout and stderr. How do i redirect exception stack traces and sysouts to the daily rolled file ?

解决方案

// I set up a ConsoleAppender in Log4J to format Stdout/Stderr
log4j.rootLogger=DEBUG, CONSOLE
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=[%t] %-5p %c - %m%n


// And I call this StdOutErrLog.tieSystemOutAndErrToLog() on startup

public class StdOutErrLog {

    private static final Logger logger = Logger.getLogger(StdOutErrLog.class);

    public static void tieSystemOutAndErrToLog() {
        System.setOut(createLoggingProxy(System.out));
        System.setErr(createLoggingProxy(System.err));
    }

    public static PrintStream createLoggingProxy(final PrintStream realPrintStream) {
        return new PrintStream(realPrintStream) {
            public void print(final String string) {
                realPrintStream.print(string);
                logger.info(string);
            }
        };
    }
}

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